@suslucoder The "Plan" array is a little unusual because the objects it contains are not all of the same structure. Usually, arrays should contain a sequence of elements of the same type. However, it is legal JSON.

If you are certain that the first element of the "Plan" array will have the structure as in your example above, you can perhaps rely on the others to all have the 2nd type structure. Otherwise, you might need to check for the existence of certain keys -- for example, by using the function QJsonObject::contains() to determine which kind of object it is.

@suslucoder said in Assign specific value to axis:

I want to assign axis Y the 3rd column. How can i do it?

The axis does not know anything about that file and columns inside it. You simply need to read your file and put data from that third column as data for Y axis. See https://doc.qt.io/qt-5/qxyseries.html
If you read documentation https://doc.qt.io/qt-5/qxyseries.html#append you will see that you have to provide X AND Y...

@suslucoder As the error message tells you addSeries takes a QAbstractSeries, not a string list as parameter. You have to pass it one of the QAreaSeries, QBoxPlotSeries, QCandlestickSeries, QPieSeries, and QXYSeries.
You also should tell us what data your file actually contains? If it contains x/y values then you first have to convert the data to numbers and create a QXYSeries instance and fill it with that data (https://doc.qt.io/qt-5/qxyseries.html#append).

@hskoglund thanks for the help! I did not try your solution, but I guess it should work because the solution from @KroMignon works and you have the same diagnostic.

@Lasith said in Getting a specific text from a text file and inserting to a QStringList!:

I use Qt 5.2

That's not supported anymore.

Is it feasible for you to upgrade to a newer version? (Qt 5.10.0 was released last week)

@koahnig Thanx mate

So does the QT appends '\0' terminator after every append? (

For QByteArray - No.

@SGaist You're right. Now it works.

Thanks a lot!

Thank you!! I changed it to the following and it works!!!!

QFile file("test.txt"); QLabel *testLabel= new QLabel; QString line; if (file.open(QIODevice::ReadOnly | QIODevice::Text)){ QTextStream stream(&file); while (!stream.atEnd()){ line.append(stream.readLine()+"\n"); } testLabel->setText(line); } file.close();

Thanks for your reply...
I agree that may be my code is not the best practice, as i learn Qt by myself only with doc and tutorials... but the program was working perfectly when i delivered it to the researchers... In fact, is working perfectly if i compile it on windows... few hour ago i borrowed a windows machine, installed qt, compiled the same project and worked just fine... So i doubt is really a code problem, because it should appear in both Windows and Linux, as the code is exactly the same...
I'm starting to think that is a linux driver problem, so i will try in another linux when i get the chance...
If someone has ubuntu 15.04 and is kind enough to reproduce this problem and tell me i would be very happy!
If anybody else reproduce this problem in other linux machine i will start a bug report

Nice to hear that it works now :-)

Workaround: Start an application (QProcess) that pipes the serialport to a localhost socket.

@mcosta

i am able to view the page inside the browser tho, why can't Qt read it then?

@jjan
Just for an iteration the code reads line by line. As long as the search text is found, it will provide the remainder of the line. There is real dependency to the content as long as it is displayble (probably also some non-displayable characters). There are some special characters marking the end of lines (line feed (LF) and carriage return (CR) are those at least).

I am not sure I completely understand the problem since
I do not see any structure in your read/write code.

But normal way to deal with structures (the same as with classes)
is to write/read every member separate in their natural form with provided by QDataStream functionality.
And you certainly need to know type of the data written to the file to read it properly.
Your problem (as far as I can understand) is related to using wrong function to read integer data,
cause you read it as char data,